Tire mold and tire

Abstract

A tire mold and tire reduce manufacturing and facilities costs and improve appearance of a product tire. The tire mold includes a tread molding body that molds a tread surface of a tire and is formed by pieces aligned in a circumferential direction of the mold. The tread molding body includes, on a mold face thereof, groove forming protrusions that form grooves on the tread surface and land forming recesses that form land portions on the tread surface and are surrounded by the groove forming protrusions. In a development view in which the pieces are connected, an air release gap in communication with the mold face of the pieces is provided along a boundary line between the pieces. At least one boundary line cuts across a plurality of the land forming recesses. Each boundary line extends through a bend, and the bend is positioned in the groove forming protrusions.

The invention claimed is: 
     
       1. A tire mold comprising:
 a tread molding body that molds a tread surface of a tire and is formed by a plurality of pieces aligned in a circumferential direction of the mold, wherein 
 the tread molding body includes, on a mold face thereof, a plurality of groove forming protrusions that form grooves on the tread surface and a plurality of land forming recesses that form land portions on the tread surface and are surrounded by the groove forming protrusions, 
 in a development view in which the pieces are connected, an air release gap in communication with the mold face of the pieces is provided along a boundary line between the pieces, 
 at least one boundary line cuts across a plurality of the land forming recesses, and 
 each boundary line extends through a bend, and the bend is positioned in the groove forming protrusions. 
 
     
     
       2. The tire mold of  claim 1 , further comprising a sipe forming blade that forms a sipe on the tread surface, wherein
 the boundary line extends while avoiding the sipe forming blade. 
 
     
     
       3. The tire mold of  claim 1 , wherein the bend in the boundary line is arc-shaped. 
     
     
       4. The tire mold of  claim 1 , wherein an inclination angle of the boundary line with respect to a width direction of the tread molding body is 30° or less. 
     
     
       5. The tire mold of  claim 1 , wherein the groove forming protrusions include a plurality of circumferential groove forming protrusions that extend in a circumferential direction of the tread molding body and form circumferential grooves on the tread surface, and the bend of the boundary line is not positioned in a pair of circumferential groove forming protrusions located outermost in a width direction of the tread molding body.